Katy Perry is said to be distraught about the death of her ex-boyfriend Johnny Lewis.
The Sons of Anarchy actor was recently found dead after suffering a fall at his home and is considered a suspect in the homicide of his elderly landlady.
Perry dated Lewis for 18 months until early 2007, and is believed to have been inspired by her former partner throughout her career.
A source told Us Magazine: "She is devastated. She had to separate from him to get ahead and focus on her career. He was in trouble then and she couldn't help him. A lot of her songs were partially inspired by him.
"I know 'The One That Got Away' and 'Circle the Drain' are partly about him, as well as Travis McCoy. But she was young and it was a time in her life she cherishes."
A spokesperson for the Los Angeles Police Department said: "It's a terrible tragedy as far as we're concerned and we're digging into the bottom of it.
"He appeared to have died from some type of fall, either from the stairway, or from the balcony, or from one of the roofs. The best we're piecing together now is that it appears that some type of altercation occurred inside of the house resulting in the death of the woman."