Crazed man: Alleged suspect Phillip Roberts was arrested for stabbing a woman with a screwdriver . A woman was stabbed from behind with a screwdriver by a crazed man while she was walking on the treadmill at 24 Hour Fitness on Tuesday morning. Officers were first called to the gym in Irving, Texas when witnesses spotted a man, later identified as 32-year-old Phillip Roberts, wearing a trench coat and carrying a suitcase acting suspiciously. Irving Police Spokesman James McLellan told NBC that officers were informed by gym staff that the 'suspicious' character was working out at the gym with a guest membership and that they'd seen him at that location with his suitcase before. 20 minutes later officers were called back at the scene because Roberts had allegedly stabbed a woman in the back with a Philips head screwdriver in a random attack. 'Her scream was so loud, even when I had the music on, I could hear her yell, and it really sounded like she was scared for her life,' said gym member Yvette Perez. 'I mean, I can only imagine. DailyMail.com spoke with witness Justin Harper who saw the stabbing unravel before his eyes. Harper, a former police officer for the Blue Mound Police Department, was working out just feet away from the incident. 'It took a little while to figure out the woman was being attacked,' Harper told DailyMail.com. Scroll down for video . Frequent member: The victim worked out at this 24 Hour Fitness on a regular basis and she did not know her alleged attacker nor was he a member . Intervened: Witness and former officer Justin Harper saw the stabbing and he tackled the crazed suspect to the ground before more officers arrived . 'I noticed a lady who looked like she was falling off a treadmill and I noticed a black male - looked like he was grabbing her, and I thought he was helping her, but then he starts hitting her,' Harper told NBC. 'They fell down right in front of my treadmill where I was at so when I saw him start hitting her. Then another guy came by and we both tackled him to the ground,' he continued. Harper says Roberts did not know the suspect and that he seemed as though he had mental issues. 'When we tackled him to the ground and he didn't say a word. He had a crazed glazed over look in his eyes,' Harper told DailyMail.com. Screams : Witness Yvette Perez said the woman screamed very loudly as though she 'feared for her life' As soon as officers arrived on the scene that's when Harper noticed that the man had a particularly dull Philips head screwdriver with him. The victim's husband told reporters he feels blessed that Harper along with another witness was there to intervene until more police arrived. The woman, whose identity has not been released, suffered non-life-threatening puncture wounds to her back and shoulder and was taken to a hospital in Dallas where she is receiving treatment. Harper said that when Roberts was asked by police why he allegedly attacked the woman he said that she just 'popped into his head,' and later went on to say that she 'was bothering him.' Roberts was transferred to the Dallas County Jail late Tuesday evening and will be charged with aggravated assault with a deadly weapon. Harper says that Roberts was 'aggressive and started fighting people.' Police are continuing to investigate the stabbing .
Phillip Roberts, 32,  allegedly stabbed a woman as she ran on a treadmill .
Witness Justin Harper said the man had a 'glazed-over look in his eyes'
Roberts was acting in a 'suspicious' way and 'carrying a suitcase'
The woman is being treated for non life-threatening injuries .
Crazed man: Alleged suspect Phillip Roberts was arrested for stabbing a woman with a screwdriver . A woman was stabbed from behind with a screwdriver by a crazed man while she was walking on the treadmill at 24 Hour Fitness on Tuesday morning. Officers were first called to the gym in Irving, Texas when witnesses spotted a man, later identified as 32-year-old Phillip Roberts, wearing a trench coat and carrying a suitcase acting suspiciously. Irving Police Spokesman James McLellan told NBC that officers were informed by gym staff that the 'suspicious' character was working out at the gym with a guest membership and that they'd seen him at that location with his suitcase before. 20 minutes later officers were called back at the scene because Roberts had allegedly stabbed a woman in the back with a Philips head screwdriver in a random attack. 'Her scream was so loud, even when I had the music on, I could hear her yell, and it really sounded like she was scared for her life,' said gym member Yvette Perez. 'I mean, I can only imagine. DailyMail.com spoke with witness Justin Harper who saw the stabbing unravel before his eyes. Harper, a former police officer for the Blue Mound Police Department, was working out just feet away from the incident. 'It took a little while to figure out the woman was being attacked,' Harper told DailyMail.com. Scroll down for video . Frequent member: The victim worked out at this 24 Hour Fitness on a regular basis and she did not know her alleged attacker nor was he a member . Intervened: Witness and former officer Justin Harper saw the stabbing and he tackled the crazed suspect to the ground before more officers arrived . 'I noticed a lady who looked like she was falling off a treadmill and I noticed a black male - looked like he was grabbing her, and I thought he was helping her, but then he starts hitting her,' Harper told NBC. 'They fell down right in front of my treadmill where I was at so when I saw him start hitting her. Then another guy came by and we both tackled him to the ground,' he continued. Harper says Roberts did not know the suspect and that he seemed as though he had mental issues. 'When we tackled him to the ground and he didn't say a word. He had a crazed glazed over look in his eyes,' Harper told DailyMail.com. Screams : Witness Yvette Perez said the woman screamed very loudly as though she 'feared for her life' As soon as officers arrived on the scene that's when Harper noticed that the man had a particularly dull Philips head screwdriver with him. The victim's husband told reporters he feels blessed that Harper along with another witness was there to intervene until more police arrived. The woman, whose identity has not been released, suffered non-life-threatening puncture wounds to her back and shoulder and was taken to a hospital in Dallas where she is receiving treatment. Harper said that when Roberts was asked by police why he allegedly attacked the woman he said that she just 'popped into his head,' and later went on to say that she 'was bothering him.' Roberts was transferred to the Dallas County Jail late Tuesday evening and will be charged with aggravated assault with a deadly weapon. Harper says that Roberts was 'aggressive and started fighting people.' Police are continuing to investigate the stabbing .
identified as 32-year-old Phillip Roberts, wearing a trench coat and carrying a suitcase because Roberts had allegedly stabbed a woman in eyes. Harper, a former police officer for the word. He had a crazed glazed over look in his Harper noticed that the man had a particularly Harper said that when Roberts was asked by police