ALLENTOWN, Pa. -

A trial has begun for an Allentown man accused of stabbing his girlfriend to death.

Jonathan Schaffer was in a Lehigh County courtroom Tuesday.

In 2012, police said Schaffer stabbed Lauren Wolstenholme to death inside their apartment on South 18th Street.

Schaffer claims it was self-defense and that Wolstenholme came at him with a knife.