MANUEL Richard Pena is surely a prince among men. Over the past 30 years he has been accused of all kinds of violent acts against his family. In 1976, he shot a now ex-wife in the genitals during a spat, in 1989 punched his stepfather, 72, and in 2004 he beat his grandson, 7, so severely he gave the boy a bloody nose. And he always managed to pretty much walk away--until now.On Friday, the 69-year-old headcase was charged with the 1982 murder of his then girlfriend, Sherri Strong. Cops found her in his house lying facedown,
