Texas death row inmate Hank Skinner insists DNA testing could exonerate him in the New Year's Eve 1993 slayings of his girlfriend and her two adult sons.

Skinner is scheduled to die Wednesday in Huntsville. On Tuesday, he visited with his French-born wife as he waited for the U.S. Supreme Court or Texas Gov. Rick Perry to decide whether to stop his execution so DNA testing can be done. Skinner and his lawyers say test results could support his innocence claims.

Skinner was convicted of killing 40-year-old Twila Jean Busby, 22-year-old Elwin "Scooter" Caler and 20-year-old Randy Busby in the Texas Panhandle town of Pampa.

Prosecutors argue Skinner isn't entitled to testing of evidence that wasn't tested before his 1995 trial.