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Robert Lynn “Bobby” Waltrip, middle brother of NASCAR Hall of Fame driver and Fox Sports announcer Darrell Waltrip and NASCAR team owner and fellow Fox Sports announcer Michael Waltrip, died Sunday.

It’s unknown when Darrell and Michael Waltrip were informed of their brother’s death. Both worked the Fox Sports’ Sunday afternoon telecast of the NASCAR Sprint Cup Auto Club 400 race at Auto Club Speedway in Fontana, Calif.

Michael, the youngest of the three Waltrip brothers, confirmed his brother’s passing on Twitter Sunday evening.

Please pray for our family. Robert Lynn 'Bobby' Waltrip passed away today. My brother Bobby was a sweet man and will be dearly missed. — Michael Waltrip (@mw55) March 24, 2014

Moments later, Darrell, the oldest Waltrip brother, also paid homage to brother Bobby.

Found out this afternoon that our brother Bobby went to be with The Lord, please pray for our family, go rest high on that mountain brother. — Darrell Waltrip (@AllWaltrip) March 24, 2014

Bobby Waltrip grew up in Owensboro, Ky., but had lived in the Concord, N.C. area the last 25 years.

While he never followed his brothers into NASCAR as a race car driver — although he did work for Darrell in the late 1980s and early 1990s when the latter formed his own Winston Cup team — Bobby became a major force in the world of go-kart racing, first as a successful kart racer himself and later as an announcer and promoter in the sport in both the World Karting Association (WKA) and the American Karting Association (AKRA).

He was believed to be in his early 60s at the time of his death.

Few details of Bobby Waltrip’s death were available late Sunday night. Someone identifying himself as Bobby Waltrip’s son had this post on the well-known go-karting news site www.karting.4cycle.com.

Condolences from friends of Darrell and Michael began pouring in Sunday night, including NASCAR star Dale Earnhardt Jr.:

@AllWaltrip prayers to you and the family DW. Very sorry for your loss. — Dale Earnhardt Jr. (@DaleJr) March 24, 2014

Bobby Waltrip’s death marked the second passing of a close relative of the Fox Sports NASCAR broadcasting crew in as many days. Howard R. Roberts, father of announcer John Roberts, died Saturday.

It was clear from Michael Waltrip’s last tweet Sunday night how much his brother’s death was weighing upon him:

Signing off tonight. Life's precious. Tell, call, text, email, the people you love and tell them you love them. God bless. — Michael Waltrip (@mw55) March 24, 2014

Below is a video interview of Bobby Waltrip at Volusia (Fla.) Speedway Park in late 2009 by Daytona Beach News-Journal motorsports writer Godwin Kelly.