The man accused of killing four people and injuring four others in a series of attacks on mainly homeless men in California has been deported from the U.S. six times and has a long criminal history, Immigration and Customs Enforcement officials say. Ramon Escobar, 47, could be charged Wednesday with murder and attempted murder in connection with the alleged crime spree. Authorities in Houston revealed they were also investigating him for the disappearance of his aunt and uncle. According to ICE, Escobar was first ordered to leave the country in 1988 and was deported to his native El Salvador six times between 1997 and 2011. He was released from ICE custody last year after successfully appealing his latest immigration case, ICE said, but the agency didn’t offer any information about his current legal status. Escobar has six felony convictions for burglary and illegal reentry.