Ingrid Peterson is a character appearing in the episode The Axeman Cometh of the ITV crime drama Midsomer Murders.
Ingrid was a groupie of the popular Blues Rock Band Hired Gun and came to be the girlfriend of the band's lead singer, Gary Cooper. Other members of the band provided her with drugs and alcohol, and as these things took over her life, Gary dumped her.
The band's lead guitarist, Jack McKinley fell in love with her and got her clean and she eventually had their daughter Willow McKinley.
In the episode, it shows that she has severe mental issues resulting from the drug and alcohol use and she is in a mental institution. Jack had wanted to take care of her on their farm but it became too hard as she needed special care.