R.I.P.

What a terrible tragedy.

He wrote some of the most celebrated songs of the last few years.

Pollex, who was Truex Jr.'s partner for nearly 20 years, died of ovarian cancer on Sunday (Sept. 17.)

The singer shared the news on social media, asking fans to 'do something nice for someone' in Jennifer's honor.

Pollex was a passionate advocate who used her platform to support those facing pediatric and ovarian cancers.

The news comes as a complete shock.

Brett Wayne Sawyer -- who often shared the ring with his brother, fellow wrestler Buzz Sawyer -- has died.

'The smile that Jimmy beamed at you from the stage was sparked by your spirit,' Buffett's wife says.

The two stars had a little-known connection.

He turned his biggest hit into an empire.