The former Colorado inmate being investigated in the death of the state prisons chief and a pizza deliveryman was pronounced dead today, following his 100-mph car chase and shootout with police in Texas yesterday. His identity still must be officially confirmed by fingerprint analysis, but investigators believe he is Evan Spencer Ebel, 28, a Colorado parolee. Authorities also are trying to determine whether the car Ebel drove was the same seen outside the home of Tom Clements, the prison official, who was shot and killed when he answered the door Tuesday evening. (More Evan Ebel stories.)