In this situation he could have walked out on the marriage rather than spend the rest of his life behind bars. Stupid is as stupid does.
This makes no sense. Why go to the Berkeley Marina, kill your wife and unborn son, dump her body there and then go back and tell the police that you were at the Berkeley Marina??
A life sentence does not mean "life". According to the Bureau of Justice statistics, the average time actually served in prison for murder anywhere in America, is only 96 months.
Even the Manson family are all up for parole, and they all would have been paroled long ago if not for the publicity of the Manson murders.