William Shatner "Saddened" by Boston Legal Costar's Death

Emmy-winning actor tweets his sympathies to Justin Mentell's family

Yesterday wasn't just a sad day for Boston Legal fans. It was a sad day for the show's costars as well.

William Shatner opted to use Twitter to express his sorrow at Justin Mentell's untimely death.

"I'm deeply saddened to hear about Justin Mentell," the former Captain Kirk tweeted. "There’s no telling how far up the ladder he may have climbed. My sympathies to his family."

The 27-year-old was pronounced dead at the scene after driving his Jeep off a steep embankment on a rural Wisconsin road just after 3 a.m. Monday.