HOUSTON—A Texas inmate faces execution on Wednesday after killing his pregnant wife, five-year-old daughter, and father-in-law more than a decade ago in what prosecutors called a brutal and senseless attack. Authorities say John Hummel stabbed his wife, Joy Hummel, more than 30 times in December 2009. He then used a baseball bat to beat to death his daughter, Jodi Hummel, and his 57-year-old father-in-law, Clyde Bedford, who used a wheelchair. He then set their home on fire in Kennedale, a Fort Worth suburb. Prosecutors say he killed his family because he wanted to run off with a woman he met at a convenience store. After the fire, Hummel fled to Oceanside, California, near San Diego, but was later arrested. Investigators say he confessed to the killings. Hummel, 45, who had been working as a hospital security guard, was convicted of capital murder in the deaths of his father-in-law and his …