Leavitt was the sixth-highest paid assistant coach nationally.
The reasoning behind Leavitt's departure is still unknown. According to Prehm, Oregon is expected to promote co-defensive coordinator Keith Heyward to defensive coordinator, and the search for a new linebackers coach is underway.
Leavitt joined the Ducks as a member of Willie Taggart's staff prior to the 2017 season after his impressive stint turning around Colorado's defense in 2015 and 2016.
With Leavitt at the helm, Oregon's defense allowed 29.0 points per game in 2017 and 25.4 points per game in 2018, an improvement from the unit's 41.4 average in 2016.
Upon hearing the news, a number of Oregon's defensive players took to social media to express their surprise.
Leavitt was the nation's sixth-highest paid assistant coach, earning $1.7 million annually, according to USA Today. He was under contract for two more years.
Leavitt will receive a maximum of $2.5 million over multiple years as part of the agreement and could receive less based on his future employment.