Thirty-eight-year-old Ryan Lossing of La Vista was one of dozens of riders providing the escort on Interstate 80 near Atlantic, Iowa, when the accident occurred on Saturday afternoon.
Three other motorcyclists were injured, two from Nebraska and one from Iowa.
State troopers say an 81-year-old driver from Iowa changed lanes abruptly and ran into the procession.
The riders were escorting the body of 69-year-old Bill Henry back to Nebraska.
Henry was co-founder of Nebraska’s Missing in America project. He died in a similar motorcycle accident two weeks ago.