The Dallas Cowboys have signed linebacker Aldon Smith to a one-year deal, according to Jay Glazer of Fox Sports.

Smith last played in the NFL with the Oakland Raiders in 2015.

Since then, Smith has dealt with legal issues that have prevented him from returning to football. However, last month, Smith was said to be in the process of applying for reinstatement.

The 30-year-old, who played his collegiate football at the University of Missouri, was originally selected by the San Francisco 49ers with the seventh overall pick of the 2011 NFL Draft.

It didn't take long for Smith to establish himself as a force, as he played in every game and racked up 37 tackles, 14 sacks, a couple of forced fumbles and a fumble recovery during his rookie campaign.

The following season, Smith was even better, rattling off 66 tackles, 19.5 sacks, an interception, and three forced fumbles en route to a Pro Bowl appearance and a First-Team All-Pro selection.

Then, the problems started.

In 2013, Smith was arrested on suspicion of drunken driving and possession of marijuana after a car accident in San Jose. He played in 11 games with the 49ers that season before voluntarily checking into a rehabilitation facility.

The following season, Smith served a nine-game suspension for violating the NFL's substance abuse and personal conduct policies for the incident that occurred the year prior. However, that August, San Francisco released Smith after another DUI arrest that involved a hit-and-run.

Smith went on to sign a one-year deal with the Raiders in 2015 but played in just nine games that season before being hit with a one-year ban by the NFL for the incident that occurred the previous summer.

He has been out of the league ever since.