The "American Idol" veteran described Jacobs' passing as "the darkest time in my life."
The Nashville musician co-wrote hit songs for Garth Brooks, Tim McGraw and Kelly Clarkson, among other artists.
The country music songwriter was found dead in the Nashville home he shared with Pickler.
"I was like Alice in Wonderland. Lost," the country singer said.
Kellie Pickler joins HuffPost Live and finds out that former American Idol contestant Clay Aiken is running for Congress in here state.
Steve Harvey is not impressed.
Plus, the in-laws are moving to Nashville.