An 18-year-old woman living in Shadyside died Thursday night after she was stabbed with a… An 18-year-old woman living in Shadyside died Thursday night after she was stabbed with a pair of scissors.

Terrence Andrews, 38, admitted to police that he killed his neighbor Lisa Maas, of Erie, Pa., to police officers when they arrived at her Hampshire Hall apartment at 4370 Centre Ave.

Andrews told police that he waited for Maas to return to her apartment at about 8:45 p.m. When she answered the door, Andrews forced his way inside and stabbed her.

Maas, a Pennsylvania Culinary Institute student, defended herself with a steak knife and injured Andrews. His wounds were treated at UPMC Presbyterian.

Andrews told police that he’d “been thinking of killing someone for some time,” the Pittsburgh Post-Gazette reported.

Andrews said that he told his doctor his medication was not working. Police found prescription medication in Andrews’ apartment but did not determine its purpose.

Andrews accused Maas of looking down on him and treating him like dirt. He told police that she insulted his body odor on Thursday.

Maas worked at the Wyndham Pittsburgh University Place hotel in Oakland and studied hotel/restaurant management.

In 1992, Andrews pleaded guilty to multiple charges, including reckless endangerment of another individual, the Post-Gazette said.

City police could not be reached for comment.