Dallas (AP) – Authorities say a man who killed his wife and then wounded two Dallas officers during a standoff before killing himself was convicted twice of sexually assaulting people. Police Chief Eddie Garcia said during a news conference Friday that 57 year old Sergio Sanchez had “an extensive violent criminal history,” and didn’t want to return to prison after he shot and killed his 31 year old wife, April Lachelle Sanchez, on Thursday. He says Sanchez served 12 years of a 24 year sentence for a 1983 attack, and was released in 1996. Then he raped a 15 year old girl three months after getting out of prison. Authorities say Sanchez called police Thursday to report he had killed his wife. The wounded officers are recovering.