The U.S. Supreme Court has refused to stop the execution of a Houston man scheduled to die for the 2002 fatal shooting of his 19-month-old son after an hours-long standoff with a police tactical squad.

Justices Tuesday rejected arguments from Timothy Wayne Adams' attorneys. The attorney contended that a 2007 Texas court ruling reducing a death sentence to life in prison for a mother convicted of killing her newborn son should apply to him as well because the cases are similar.

The court's denial came about five minutes before Adams' scheduled execution.

The 42-year-old Adams is set for lethal injection in Huntsville for the death of his son, Timothy Jr., who was shot twice at close range by his father after the police standoff at his family's apartment.