Onwualu was placed on the reserve/retired list by the Raiders on Monday.
Carolina signed Onwualu (knee) to a contract Wednesday.
Onwualu (knee) reverted to injured reserve after clearing waivers, according to the NFL's official transaction log.
Onwualu (knee) was waived/injured by the Jaguars on Friday, Phillip Heilman of The Athletic reports.
Onwualu was ruled out for the 2019 season Tuesday with a knee injury, Michael DiRocco of ESPN reports.
Onwualu suffered a right leg injury at practice Monday and exited the field via a cart, Phillip Heilman of The Athletic reports.
The Jaguars claimed Onwualu off waivers from the 49ers on Tuesday, per the league's official transaction report.
Onwualu was waived by the 49ers on Monday, Matt Maiocco of NBC Sports Bay Area reports.
Onwualu (groin) has reverted to injured reserve, per NFL Communications.
The Chargers waived/injured Onwualu (groin) on Wednesday, Eric D. Williams of ESPN.com reports.