TULSA, Oklahoma - A man was shot and killed while answering his door Sunday morning at his Tulsa apartment. Now, police are looking for the killer.

The shooting happened on private property, just steps away from Union High School.

Police say they believe a man shot a gun twice at the Somerset Apartments early Sunday morning. One of the shots hit the victim in his neck, killing him.

Sergeant Dave Walker said, "He was answering the door when he got shot."

Walker said a woman knocked on the door then a man showed up and confronted the victim.

"It's almost like it was a rouse-type thing to get those people out," he said.

The victim's roommate and a neighbor told police what they saw and heard.

Walker said, "I think what was happening is the person that is our victim realized something was happening and was trying to shut the door, so there was some altercation at the door."

Police said they're not sure how well the victim and his roommate knew each other, and said there was nothing the roommate could do to save him.

"I'm sure there was some sort of life-saving measures going on, but there was none to be had," Walker said.

The victim was in his early 20s.

This is Tulsa's 40th murder of the year. If you know anything that can help police, call Crime Stoppers at 918-596-COPS.