NYPD investigating 911 calls from Katie Couric's dead husband

Katie Couric has become the focus of one strange investigation.

The NYPD is probing a series of mysterious 911 calls apparently originating from a phone line registered to Couric's late husband, Jay Monahan.

Monahan died in 1998 after a battle with colon cancer. But, according to the New York Daily News, his phone dials 911 every Tuesday around 2 a.m. There have been at least 10 instances of the calls since last month, according to the Daily News.

Couric relayed the bizarre story to her studio audience during a commercial break this week. She says she asked NYPD Commissioner Raymond Kelly to investigate the matter.

"So I called Ray Kelly, who I know just through the years seeing at different things. 'Ray, this is so weird but can you help me? I don’t know what to do,'" Couric told the audience, per an eyewitness account in the Daily News.

Whenever the mysterious calls are made, the police call back to check. In addition, a patrol car is sent to investigate. Couric told her audience that she always has a hard time getting back to sleep afterward.

Some experts believe "spoofing" is to blame for the calls. That's an illegal technique in which a hacker uses a device to hijack a phone line. Other celebrities who have fallen victim to the trick include Ashton Kutcher, Chris Brown, and Kim Kardashian.