PHILADELPHIA (AP) _ A man charged with stabbing to death his pregnant girlfriend paid $400 to have curses put on a prosecutor and a detective, officials said.

But black magic didn't spare him from being convicted and sentenced to life in prison.

Ruben Andujar, 46, was convicted of murder Dec. 22 in the 1987 slaying of Angelina Colon, 29. The jury sentenced him on Tuesday.

Andujar paid $200 each for the curses on Assistant District Attorney Edward Cameron and Detective Michael Duffy, who investigated the stabbing, Cameron said.

''It was a cheap curse,'' Cameron said. ''I hear a good curse goes in the neighborhood of $10,000.''

Cameron said a member of the victim's family reported the curses to authorities. Andujar allegedly had a relative take the money to the spell- caster.