Here's what we know about Todd Palin, who appears to have filed for divorce from his wife and former Alaska governor Sarah Palin

While Todd Palin, known informally as the "first dude," did not regularly appear in headlines as much as his wife, he still played a role in her political career when she served as governor of Alaska. Emails obtained by NBC News showed that he regularly communicated with other Alaskan political figures on government affairs.

Sarah Palin became governor of Alaska in 2006 and resigned before the end of her four-year term in 2009, following her time as presidential running mate for the late Sen. John McCain in 2008.

When asked if Todd helps his wife Sarah with her speeches, Jim Palin, Todd's father, told Newsweek in a 2011 interview that "he helps her prepare, but he doesn't critique."

Todd Palin was known for his prowess on a snowmobile after winning Alaska's Iron Dog snowmobile race four times, Newsweek reported. His wife Sarah even made a bid for him to get his own reality TV show showcasing his passion.

However, in one of the few times he made headlines, Todd sustained "broken and fractured ribs, a collapsed lung, a broken shoulder blade, a broken clavicle, and leg injuries" in a snowmobile accident in 2016, NBC News reported.

Read more: Sarah Palin cancels appearance at Trump event after husband injured in 'very serious' snowmobile crash

In December 2017, Sarah and Todd's eldest son, Track Palin, was accused of breaking into his parents' home. Track was also accused with assaulting his father when Todd confronted him with a gun, leaving Todd with bleeding cuts on his head, The Washington Post reported.

Track pleaded guilty to a lesser charge in veteran's court, NBC News reported.

Sarah Palin posted a picture of her husband on Instagram a few weeks after the attack.