The 6-foot-3, 290-pound McDonald remains a solid run-stuffer with pass rushing ability from the position. The 30-year-old started 14 games in 2014 and ended as Pro Football Focus' No. 12 overall 3-4 defensive end.
Where the signing will be questioned is from an off-field perspective.
Previously in 2014, McDonald was arrested on suspicion of committing domestic violence against his fiancée. In November, the Santa Clara District Attorney's office declined to press charges due to insufficient evidence.
Clearly, the Bears are comfortable bringing on a player who can contribute on the field, but one that is on thin ice and has a chance to miss time if he's embroiled in another incident.