Just this weekend, a mother named Marie Moore, who has a history of mental instability, fatally shot her son and thereafter killed herself at a Florida shooting range.

44-year-old Marie Moore was at Shoot Straight, in Casselberry, FL, which is 20 minutes north of Orlando, on Sunday, with her son 20-year-old Mitchell. According to witnesses and a surveillance video, the two appeared to be getting along until Moore went behind her son with a rented revolved and fired a single bullet at the back of Mitchell’s head. Thereafter, she placed the gun in her mouth and pulled the trigger.

One witness said: “They were both very hyper and nervous. I was keeping an eye on them, actually, because it’s a very small location in there. I noticed both of them were very anxious with each other. She kept getting very close to him when he was firing.’ He also stated that Marie, ‘ran out just prior to that grabbed more ammunition and I watched her do that. The shooting happened right after that.”

Another witness named Bobby Davidowitz said: “When I heard a gunshot I look and I see this kid collapsing spitting up blood it took me a second to register.” Bobby and his friends noticed something wasn’t quite right before it happened. “These people are too hyper to be at the gun range she was walking back and forth,” he further stated.

Based on a police report, Mitchel’s father, Charles Moore, told the police that he believed that Marie was barred from that particular gun range by reason of a suicide attempt she had at the same location several years ago.

However, police say that they do not have any record of an incident involving Marie although they did state that Marie was once admitted to a hospital for observation under the state’s Baker Act in 2002. By reason of privacy policies, the information was not released as to the reason of admission. Also, it was reported that Marie had two DUI convictions on her record.

At the day of the incident, Marie and Mitchel had just bought a membership to the Club and the murder weapon was rented from the gun range. Although background checks were required when someone buys a firearm, this kind of check cannot be legally performed by gun range owners on people who bring with them their own guns or rent ones from the range. None from the Shoot Straight Gun Range gave out a comment.

Mitchell died on the scene while Marie died hours later at the Florida Hospital Altamonte. On Monday, the police were still trying to figure out what drove Marie to kill her son. “There was no argument or any other sign of a problem,” said Casselberry police Lt. Dennis Stewart.