'Titans' star Vincent Kartheiser investigated twice for misconduct allegations on HBO Max series

Vincent Kartheiser was investigated twice for possible misconduct while filming for the new season of TV's "Titans."

The former "Mad Men" star was the subject of internal investigations conducted by Warner Bros. Television's labor relations department, a person familiar with the situation but not authorized to speak publicly told USA TODAY on Saturday.

Kartheiser, who plays Dr. Jonathan Crane (aka the villain Scarecrow) in the third season of the HBO Max superhero series, was accused of displaying immature behavior of a verbal nature that didn’t rise to level of termination but did warrant corrective action, the source says. The 42-year-old actor was addressed directly and counseled on behavioral matters as a result of the investigation.

As the production was finishing up weeks later, another complaint was filed against Kartheiser. The second complaint also led to an investigation and resulted in additional measures, including a monitor being hired to watch activity on the set in Canada. The investigations were conducted remotely because of COVID protocols and restrictions on international travel.

"Vincent Kartheiser vehemently denies the allegations," Kartheiser's representative told USA TODAY in a statement. "Warner Bros. investigated this matter and made clear to Mr. Kartheiser its expectations for behavior on the set, and he agreed to comply with their directives."

Warner Bros. Television declined comment to USA TODAY.

The investigation was first reported by Deadline.

The first two seasons of "Titans" premiered on the DC Universe video-on-demand platform, with the third season airing on HBO Max. The show synopsis says the series "follows young heroes from across the DC Universe as they come of age and find where they belong."

Kartheiser was previously known for his role as rising advertising executive Pete Campbell in AMC's "Mad Men" and won two Screen Actors Guild ensemble awards with the show. In 2014, he married his "Mad Men" co-star Alexis Bledel in a secret ceremony.

Contributing: Kim Willis

This article originally appeared on USA TODAY: Vincent Kartheiser: 'Titans' star investigated for alleged misconduct