Former New England Patriots player Aaron Hernandez can be seen on surveillance video walking through his home with a gun less than 10 minutes after prosecutors say he killed a man, according to testimony Wednesday by an employee of firearms manufacturer Glock. It was the most conclusive testimony to date in the monthlong trial that puts a weapon in Hernandez's hand around the time of the slaying. Hernandez is charged with murder in the killing of Odin Lloyd, who was dating the sister of Hernandez's fiancee. Lloyd was shot to death early on June 17, 2013, in an industrial park near Hernandez's home in North Attleborough, sending his last text message at 3:23am, and two witnesses have testified they heard loud bangs around that time. The murder weapon has never been found. Scroll down for video . Former New England Patriots football player Aaron Hernandez sits in court during his trial . Former New England Patriots football player Aaron Hernandez is seen in footage from his home security system . A  handgun is shown during the murder trial for former New England Patriots football player Aaron Hernandez . Kyle Aspinwall, a former New Hampshire police chief who now works for Glock, began his testimony Wednesday by showing jurors a Glock 21. The semiautomatic handgun uses .45-caliber bullets, and prosecutors have argued that based on ballistics evidence, a Glock 21 was the murder weapon. As Aspinwall testified, prosecutor Patrick Bomberg played clips of video recorded by Hernandez's extensive home surveillance system June 17, as well as still photos taken from the videos. At several points in the video, Hernandez can be seen carrying a black object in his hand, an object his defense team has said could have been a TV remote or another electronic device. But Aspinwall said his opinion was based on various characteristics of the weapon, including the curvature of back strap, the magazine well and trigger guard. 'In my opinion, the firearm shown in the video stills is a Glock pistol,' he said. The earliest clip played Wednesday was taken at around 12:45am before Hernandez leaves the house with co-defendants Carlos Ortiz and Ernest Wallace in a rental car. Prosecutors have said the three picked up Lloyd in Boston, then drove him back to North Attleborough. Ortiz and Wallace are also charged with murder and have pleaded not guilty. They will be tried at a later date. Former New England Patriots football player Aaron Hernandez, left, and his defense attorney Charles Rankin watch as footage from Hernandez's home security system is played during his murder trial . Prosecutor Patrick Bomberg, left, questions Kyle Aspinwall, an employee of weapons manufacturer Glock . Aspinwall testified that in the 12:45am clip, Hernandez can be seen switching a pistol from his right hand to his left as he walks through the living room. Later, after Hernandez, Ortiz and Wallace return to the home at around 3:30am, Hernandez can be seen outside the door to his basement as he faces the camera a few feet away while holding the object in front of him. 'This is a picture of the defendant holding what appears to be a handgun in his left hand in a reverse grip,' Aspinwall said. At various points in his testimony, Aspinwall stood and used his Glock to demonstrate how Hernandez was holding the weapon. At around 2:30pm, less than 12 hours after the killing, other video shows Hernandez and Wallace hanging out by the pool before Hernandez gets a black object out of the rental car. Aspinwall testified that the object appears to be the magazine of a gun.
Aaron Hernandez can be seen on surveillance video walking through his home with a gun less than 10 minutes after prosecutors say he killed a man . Glock employee Kyle Aspinwall testified that  Hernandez can be seen switching a pistol from his right hand to his left in his living room at 12:45am . Then, at 3:30am, Hernandez can be seen outside his basement as he faces the camera a few feet away while holding the object in front of him . The murder weapon has never been found .