SACRAMENTO, Calif. (KCRA) - 
A former top aide to Mayor Kevin Johnson is now the subject of a criminal investigation conducted by the Sacramento Police Department, a spokesman said Wednesday.


Lisa Serna Mayorga, daughter of former Sacramento Mayor Joe Serna, resigned last week. She's accused of using a city-issued credit card for personal purchases.
Serna Mayorga had worked as the council operations manager before she was appointed to a position in the mayor’s office just weeks ago, Johnson’s spokesman said earlier this week.
Sacramento police are working with the City Manager's office along with the Sacramento County District Attorney’s office to look further into her credit card usage.