MacTavish missed the 1984–85 season after being convicted of vehicular homicide, having struck and killed a young woman while he was driving under the influence of alcohol. MacTavish pleaded guilty to vehicular homicide and driving under the influence of alcohol the night of January 25, 1984, in Peabody, Massachusetts. Kim Radley, 26, of West Newfield, Maine, died four days later of injuries sustained in the crash. MacTavish was sentenced to a year's imprisonment for the offence. While incarcerated, he watched most of the games that were televised.