A 41-year-old San Francisco plumber who was on a losing streak at local casinos and faced eviction for not paying his rent was found guilty Monday of slaughtering a family of five inside their Ingleside neighborhood home after targeting them for robbery. On its seventh day of deliberations, the San Francisco Superior Court jury found Binh Thai Luc, an undocumented Vietnamese immigrant with a violent criminal past, guilty of five counts of murder in the massacre of the Lei family on March 23, 2012. ---------------------------- Before the killings, Luc was convicted in 1998 of committing an armed robbery at a...