Longtime San Diego Padres radio broadcaster Ted Leitner revealed in a tweet Tuesday that he was diagnosed with cancer.

Leitner will have a tumor in his kidney removed Thursday. He said Wednesday will be the last game he calls before stepping away indefinitely, though he told reporters he hopes to return within a month.

"From everything I've been told, the outlook is positive," Leitner said Sunday, via MLB.com. "My other kidney is apparently healthy. My attitude is let's get this done and return to what I love doing as soon as possible."

Leitner, 71, has called games for the Padres since 1980. In that time, he has never missed more than a series and never missed a road trip.

"We wish our dear friend, Ted Leitner, a speedy recovery from surgery," said Padres executive chairman Ron Fowler and general partner Peter Seidler in a joint statement. "While we'll miss hearing his voice in the booth over the next few weeks, we know he'll be back healthy and stronger than ever. Our thoughts and prayers are with him during this time."

Leitner has also called games for the NBA's Clippers and NFL's Chargers. He's currently the voice of San Diego State football and basketball in addition to handling radio duties for the Padres.

While Leitner is recovering, Tony Gwynn Jr. will join Leitner's regular partner, Jesse Agler, in the booth.

Agler tweeted Tuesday, "Teddy is a legend and one of the most talented people I have ever known. More than that, he is a phenomenal friend, partner and mentor. Thankfully, he is also as strong and tough as they come. Wishing you nothing but the most speedy of recoveries, Theodore."