KANSAS CITY, Mo. — Kansas City Chiefs linebacker Jovan Belcher spent part of the night at a woman's apartment and stayed until 6:30 a.m. CST Saturday before going home, killing his longtime girlfriend and later himself, Kansas City police said Tuesday.

Police had contact with Belcher, 25, outside the woman's apartment building about 2:50 a.m. CST Saturday after someone called 911 to report a suspicious car that had been in the parking lot for about two hours with its lights on.

Officers located the car, a Bentley with temporary tags, and saw a man sleeping in the driver's seat. They knocked on the window, woke the man — later identified as Belcher — and asked what he was doing. He told officers he was waiting for his girlfriend who lived in the building, said police spokesman Darin Snapp.

Officers asked Belcher to call his girlfriend and Belcher made a call from his cellphone, Snapp said.

A short time later, a woman opened the apartment-building door and let Belcher inside. The woman waved at police, who left because Belcher had no outstanding warrants and had committed no crimes. Belcher was cooperative and might have consumed alcohol but did not appear inebriated, Snapp said.

A woman confirmed to The Kansas City Star that Belcher stayed at her apartment, on a couch. She said the woman Belcher was trying to visit, Brittni Glass, was asleep and thus Belcher couldn't contact her. The woman said Glass and Belcher were merely friends.

Glass told the newspaper: "I feel like this whole thing has been blown out of proportion." She declined further comment.

Snapp said two women verified to detectives Belcher stayed at the apartment until 6:30 a.m., when they woke him.

Belcher apparently left their apartment and drove to the home he shared with his girlfriend, Kasandra Perkins, 22, and their 3-month-old daughter, Zoey.

The couple had a confrontation after Belcher arrived at home. His mother, who was staying with the couple, later said she heard yelling and gunshots. Perkins was shot nine times, according to sources close to the investigation.

Belcher then drove to the Chiefs' practice facility near Arrowhead Stadium and encountered team general manager Scott Pioli.

Belcher stepped out of his car with a gun pointed at his own head, police said.

"I did it," he said, according to police. "I killed her."

Team officials reportedly knew the couple had a history of arguments about relationship and financial issues. The Chiefs had provided counseling and "were bending over backward" to help, Police Sgt. Richard Sharp said.

But Belcher told Pioli the assistance wasn't enough to fix their problems, adding it was "too late."

Sharp gave this series of events:

Pioli tried to persuade Belcher to lay down the weapon. Belcher thanked Pioli for everything he had done for him. He asked if Pioli and chief executive officer Clark Hunt would take care of his daughter. Head coach Romeo Crennel and linebackers coach Gary Gibbs arrived in the parking lot and Belcher said, "Guys, I have to do this." Crennel tried to dissuade Belcher.

As Pioli and Crennel tried to reason with Belcher, the men heard police sirens. Belcher walked a few steps away with the gun still pointed at his head. "I got to go," he reportedly said. "I can't be here."

Belcher, according to police, knelt behind a vehicle and made the sign of the cross across his chest before firing a bullet into his head.

Police said they believe Belcher killed himself because he was distraught over what he had done to Perkins.

"He cared about her," Sharp said. "I don't think he could live with himself."