BURNSVILLE, Minn. - The family of a man fatally shot by police outside a McDonald's restaurant in Burnsville is suing the city and the officers involved.

In a federal civil rights lawsuit, relatives of Map Kong say the shooting was excessive and unconstitutional because he did not pose a substantial threat. Kong was shot 15 times last March by officers who said they feared he could hurt someone with the knife he held.

The lawsuit says three officers were negligent in failing to respond to Kong's mental health crisis.

The Star Tribune says Kong's two sons, parents and nine siblings are seeking more than $2 million in damages.

In June, a grand jury concluded that the four officers involved in the fatal shooting were legally justified to use deadly force. At that time, the Dakota County grand jury concluded that because Kong refused multiple orders to drop a large "dagger-style" knife, in addition to the fact officers attempted to subdue him with a Taser, which was not effective, presented both police and the public with a risk of safety.

A toxicology test also revealed Kong had both ampehtamine and methamphetamine in his system at the time of his death.