Im writing a short story with a female detective and before I start I want to know if this is over used, my character's mother dies when the detective is 12 years old and a lot of fiction detectives seem to have a dead mother

Bones's parents went missing
The detective from Castle (yeah I dont watch the show that much but I know the girl's mother was murdered)
Some people believe Sherlock's mother was murder


The only difference is my character's mother died of natural causes so she wasn't like "I must bring all murder victims to justice! Because I couldn't save my mother!" She just does it because she always wanted to be a detective