Carlos Monzon, a former middleweight boxing champion,...

Carlos Monzon, a former middleweight boxing champion, testified in his trial on homicide charges that he did not kill Alicia Muniz, a Uruguayan model and his longtime companion.

Monzon, 47, is charged with simple homicide in the death of Muniz. He has been held in preventive detention in Mar Del Plata, Argentina, since Feb. 14, 1988, the day Muniz was found crumpled below the second-floor balcony of an apartment Monzon was renting.

Monzon, the champion in 1977, has admitted he drank alcohol and struck Muniz on the night she died. But he said she slipped from a balcony, and when he tried to grab her, he fell, too.

During pretrial testimony, however, a witness testified that Monzon carried Muniz to the balcony on his shoulder, and threw her over.

Monzon faces eight to 25 years in prison, if convicted.