LOS ANGELES -- Family members of four of the eight passengers killed in a helicopter crash with Kobe Bryant and his daughter Gianna have joined the NBA star's widow in filing wrongful death lawsuits against the companies that owned and operated the aircraft.

The suits on behalf of three members of one family, and a woman who helped coach Bryant's 13-year-old daughter in basketball, were filed electronically Sunday in Los Angeles Superior Court.

The pair of lawsuits comes about two months after Bryant's widow, Vanessa, also sued Island Express Helicopters Inc., which operated the Sikorsky, and its owner, Island Express Holding Corp.

A person who answered the phone at Island Express Helicopters declined to comment and an email from The Associated Press requesting comment was not immediately returned.

Unlike Vanessa Bryant's lengthy lawsuit, the new identical 7-page cases do not name the dead pilot, Ara Zobayan, or his representative, as a defendant. All the suits allege that the two companies were careless and negligent.

One suit was filed by two children of Orange Coast College baseball coach John Altobelli and his wife, Keri, who died in the crash along with their daughter Alyssa, who played basketball with Gianna. Another suit was filed by the husband and three children of Christina Mauser, who helped Bryant coach the girls' basketball team.

The group was heading to a basketball tournament Jan. 26 when the chopper crashed in thick fog northwest of Los Angeles.

An initial National Transportation Safety Board report said there were no signs of engine failure from the wreckage recovered. Zobayan had nearly navigated the helicopter out of blinding clouds when the aircraft suddenly turned and plunged into the mountainside.

Vanessa Bryant, who filed the suit the same day as her husband's large public memorial service in February, alleged that Zobayan was careless and negligent to fly in the fog and should have aborted the flight.

Also killed in the crash were Sarah Chester and her daughter Payton, who was another of Gianna's teammates.