MILWAUKEE, WI (WTAQ) - A judge ordered a mental exam today for a 17-year-old boy charged with killing a suburban Milwaukee couple in a drunk driving crash on New Year's Day. Authorities said Kelly Duke sped through a Milwaukee intersection in a stolen car, and he slashed the roof off a vehicle driven by Edward Thaves of New Berlin. Thaves and his wife Jean were killed. Today, Duke's lawyer said his client might not be mentally competent to help with his defense -- and Circuit Judge David Borowski agreed that a mental exam is in order. The findings are due in about a month. The attorney had indicated he would seek a reduction in Duke's 200-thousand-dollar bond. But the victims' family started an on-line petition against lowering the bail. Edwin Thaves, the victims' son, tells the Journal Sentinel that 660 people had signed the petition by today. And he didn't buy the possibility that Duke is mentally incompetent. Thaves said Duke knew enough to flee to his home two miles away right after the crash -- and he was also competent enough to change lawyers in his court case.