An 18-year-old has been charged in an 81-year-old man's "violent death" at an independent group home on Blue Bird Avenue in Bartow, Polk County Sheriff Grady Judd said. Moses Ojeda, 18, is accused of murdering his roommate, 81-year-old Patrick Benway, on Sunday, May 18. During a press conference on Monday, Sheriff Judd shared that Ojeda stabbed Benway 113 times at a group home managed by ET Home Care, LLC. Judd said that when deputies asked Ojeda why he stabbed Benway 113 times, he replied, "The knife wasn't very sharp." "Our victim was in bed, asleep when this occurred," Judd said. Around 11:45 p.m. Sunday, investigators said Ojeda entered Benway's bedroom before stabbing him to death. Deputies said Benway did not physically resist but did ask, according to Ojeda, "Why would you want to do this to me?" The sheriff added that Ojeda had just moved into the group home the day before the murder and had been evaluated on his mental health, or "Baker Acted," six different times. "Ojeda told detectives that he did not have any problems with the victim and described him as a good person," deputies said in a news release. "Ojeda stated he has no regrets and he wanted to kill him because he was 'already dying.'" While Ojeda has no prior criminal history, Judd said the 18-year-old has committed what appears to be domestic battery violence against his mother. "But, his mother was protective of him and she wanted to get him help," Judd said. "And she really meant well and went above and beyond to help him, but at the end of the night, he was violent and he was dangerous and he murdered this person." Ojeda has been charged with first-degree murder and tampering with physical evidence. In the release, Judd called the case "a senseless and tragic act of violence" and said that his agency "worked diligently" to hold Ojeda accountable.