Police say several family members of Demouchet received phone calls from him that night, saying he intended to kill Perez and himself.
His sister spoke with him on his cell phone and realized he was outside of her home.
Demouchet warned her not to come outside or he would kill himself and Perez.
The sister went outside to investigate and noticed the couple sitting in Demouchet’s car. Seconds later, gunshots rang out.
Another sister ran outside, opened the car door and found Demouchet and Perez dead.