ATLANTA , Georgia -LRB- CNN -RRB- -- Four people in two states have been arrested as part of an investigation into the Final Exit Network , an organization that police believe helped a Georgia man end his life in June , authorities said Thursday . Claire Blehr , 76 , of Georgia , and Thomas E. Goodwin , 63 , of Florida and Georgia , were two of the four arrested . John Celmer , 58 , lived in Cumming , north of Atlanta . Cumming police , the Forsyth County coroner and the man 's relatives all had suspicions that his death was an assisted suicide , and the Georgia Bureau of Investigation launched an investigation , the agency said in a news release . The GBI on Wednesday set up a sting operation at a residence in adjoining Dawson County , using an undercover agent who had posed as a terminally ill man seeking assistance with his suicide , the statement said . Claire Blehr , 76 , of Atlanta , Georgia , and Thomas E. Goodwin , 63 , of both Punta Gorda , Florida , and Kennesaw , Georgia , were arrested , the GBI said . Meanwhile , authorities in Baltimore , Maryland , arrested Dr. Lawrence D. Egbert , 81 , of Baltimore in connection with the investigation . A second person , Nicholas Alec Sheridan , 60 , also of Baltimore , was arrested Wednesday night , GBI spokesman John Bankhead said Thursday . All four face charges of assisted suicide , tampering with evidence and violation of the Georgia 's Racketeer Influenced and Corrupt Organizations Act , the GBI said . The Final Exit Network , based in the north Atlanta suburb of Marietta , identifies itself on its Web site as `` an all-volunteer organization dedicated to serving people who are suffering from an intolerable condition . Network volunteers offer you counseling , support and even guidance to self-deliverance at a time and place of your choosing , but you always do the choosing . We will never encourage you to hasten your death . '' Celmer suffered from `` very , very severe mouth and throat cancer , '' his 85-year-old mother , Betty Celmer , said from her home in the Buffalo , New York , suburb of East Amherst . `` They were rebuilding the whole mouth , '' she said . `` He was suffering terribly , that I know . '' She said her son had undergone numerous surgeries and `` sounded depressed . '' When he died , she said she had no idea his death might have been a suicide . In a statement released by the GBI , Celmer 's widow , Susan , said that she and her family `` are gratified that the GBI and other law enforcement agencies have pursued this matter vigorously and that their investigation has led to the arrests reported today . '' She said she will not comment further and requested privacy , referring future questions to her attorneys . An e-mail to Jerry Dincin , a man listed as Final Exit Network 's vice president and treasurer on its Web site , was not answered Thursday . A call to Final Exit was answered by a recording . The method used in the suicide was helium inhalation , according to the GBI statement . People pay $ 50 to join the Final Exit Network , according to the GBI , and complete an application process . They are then visited by an `` exit guide '' assigned to the case . `` During the visitations , the member is instructed to purchase two helium tanks of a specific size and brand and a specific type of hood known as an ` exit bag , ' '' according to the GBI statement . `` On the day of the event , the member is visited by the ` exit guide ' and a ` senior exit guide . ' The senior exit guide instructs the member through the process . '' Goodwin and Blehr were told the GBI agent suffered from pancreatic cancer , The Atlanta Journal-Constitution reported . At the Dawson County residence on Wednesday , Goodwin allegedly walked the undercover agent through the steps and demonstrated how he would hold the agent 's hands to stop him from removing the exit bag , Bankhead said . The GBI said that after the death occurs , `` all evidence is removed from the scene by the ` guides ' and discarded , as evidence indicated happened in the Cumming case . '' Goodwin 's former neighbors in Kennesaw told CNN he moved to Florida a few years ago but still owns his large home there and returns to check on it occasionally . Kay Makarenko , 69 , who lives behind Goodwin 's home , said she was shocked to hear of his arrest . `` I said , ` It ca n't be the same Ted Goodwin . ' '' After the arrests Wednesday , authorities in Georgia , Florida , Maryland , Michigan , Ohio , Missouri , Colorado and Montana began executing search warrants and conducting interviews as part of the probe into the Final Exit Network , the GBI said , adding that GBI agents were in each state except Colorado to assist . In Phoenix , Arizona , police have linked the 2007 death of a 58-year-old woman to the Final Exit Network , Maricopa County Attorney Andrew Thomas said Wednesday , according to CNN affiliate KPHO-TV in Phoenix . Thomas said the woman , Jana Van Voorhis , was not terminally ill but suffered from mental illness and depression . He said a police investigation turned up records of visits from Final Exit guides to Voorhis , according to KPHO . No arrests have been made , but Thomas said he expects his office to wrap up its investigation and decide if charges are warranted within 60 days . CNN affiliate WDIV-TV in Detroit , Michigan , reported that search warrants were executed regarding two Michigan residents who sit on Final Exit 's board of directors . The Final Exit Network Web site features a `` Wall of Fame '' with photos of Dr. Jack Kevorkian , among others . Kevorkian was released on parole in June 2007 after serving more than eight years of a 10 - to 25-year sentence in the 1998 death of a man suffering from amyotrophic lateral sclerosis , also known as Lou Gehrig 's disease . `` We believe the needs of those who are suffering are paramount , '' the organization says . `` We applaud the work of organizations that seek legislative action to strengthen our right to die a peaceful and painless death at the time and place of our choosing . However , we feel that legislative change will not come soon enough for the many people who need help now and in the interim . '' Betty Celmer , meanwhile , declined to share her thoughts on assisted suicide or the Final Exit Network 's alleged involvement in her son 's death , saying she lacks specifics . `` He 's in a far better place , '' she said . `` That 's the only comment I 'm going to make . '' CNN 's Ashley Broughton and Jim Kavanagh contributed to this report .