Bail was set at $1 million for a 29-year-old Mukwonago man charged in the fatal stabbing of  Samantha Peterson on Sept. 5.

David A. Wapp, according to a criminal complaint filed against him today in Waukesha County Circuit Ccourt, tried to kill himself after Peterson’s death by overdosing on Methadone and Xanax.

The couple had been boyfriend and girlfriend, the complaint says.

Wapp is charged with first degree intentional homicide and domestic abuse repeater. He faces a sentence of life imprisonment. Wapp was released from prison just days prior to the stabbing.

The complaint says Wapp repeatedly stabbed Peterson, 21, of  Waukesha,  with a pocket knife in the chest and sliced her neck to prevent her from screaming. The couple reportedly were in a parked car in the 100 block of S. West Ave. around 10:30 p.m. when the attack happened.

Peterson was dead by the time police arrived. Police found a bed sheet placed over her body.

A witness to the stabbing said the couple had argued in the car before the attack.

Earlier in the evening, Wapp brought Peterson to a West St. address where Wapp and the witness had earlier played video games. She brought along her pit bull dog, the complaint says.

The witness said he sensed tension between the two. The couple then went into her car to talk and an argument ensued in which Wapp said he snapped, the complaint says.

During the attack, the pit bull, which was in the car, was accidentally gashed in the snout and later put inside the house. A trail of dog blood alerted the witness that something had gone wrong.

The witness said he then went outside and saw a bloody knife in Wapp’s hand, the complaint says.

“I stabbed her. I killed her bro,” Wapp told the witness, the complaint says.

Peterson was moved from the driver’s seat to the back of the car, the complaint says. Wapp told the witness that he expected to go to prison for a long time, the complaint asays.

Police found Wapp in a northwest-side Milwaukee hotel. He tried to flee by crawling through a rear bathroom window, the complaint says.

He was taken to a hospital for medical treatment after passing out and becoming non-responsive because of the drugs he had taken, the complaint says.

A preliminary hearing in the the criminal case is set for 3 p.m. on Sept. 23.