Bill Pierce

Bill Pierce is the father of Maggie Pierce.

History
Bill came to Seattle to comfort Maggie after her mother died. Richard sent a helicopter for him and met him on the roof. Richard then led Bill to Diane's room, where Maggie was hugging her mother's body while Amelia and Meredith sat with her. When she saw him, Maggie got up and hugged her father.

Romantic
He was married to Diane Pierce. During their marriage, she had a long-term affair with the man who fixed their car. They eventually split up over it.