One of the longest relationships in Seattle sports radio history will end Monday when Dave Grosby hosts his final show at KJR-AM. He is expected to resurface across town at 710 ESPN.

One of the longest relationships in Seattle sports-radio history will end Monday when Dave Grosby hosts his final show at KJR-AM, the station confirmed Friday.

Grosby started at KJR-AM when it first changed to an all-sports format in 1991. He has been with the station for all but about three years in that span, leaving for KIRO in 1993 and returning to KJR in 1996.

He is expected to resurface at 710 ESPN, apparently to serve as a co-host for Kevin Calabro’s 3 p.m. to 6 p.m. show in August. He also will continue his association with 710 ESPN (formerly KIRO) that began this year as the radio voice of Seattle University men’s basketball games.

KJR-AM station manager Rich Moore said Grosby will host his final show on KJR-AM on Monday from 3 p.m. to 5 p.m. as part of the regular “Groz with Gas” show that has been a fixture of the station for more than a decade.

Moore said KJR-AM will “be adding something back” to fill in for the loss of Grosby. Moore said Grosby is leaving by his own choice.

“We had an excellent relationship with him and he was a huge part of KJR-950,” Moore said. “It was still working.”

Grosby had his own show on KJR until the spring of 2008, when his role was reduced to co-host of the “Groz with Gas” show in a cost-cutting move. That ended a string of 17 consecutive years in the market hosting his own show, including his first stint at KIRO.

His move marks the first significant move of a personality from KJR to 710 ESPN since the latter went to an all-sports format one year ago. 710 ESPN has been looking for a co-host to pair with Calabro, the longtime voice of the Sonics who has been hosting his own show.

Grosby, along with serving as the radio voice of Seattle U., handles the selling of the rights for those broadcasts, further strengthening his relationship with 710 ESPN in the past year.

Bob Condotta: 206-515-5699 or bcondotta@seattletimes.com