Did Britney's Dad Assault Sam Lutfi?!?

In a lawsuit filed today, Brit's former manager Sam Lutfi claims that on the night of January 29, 2008 he was punched by Jamie Spears.

According to the court documents, Sam was standing in the kitchen of Brit's home in the Summit when Jamie "burst into the house."

Jamie then "charged at Lutfi," punched him in the chest and "threatened to kill" Lutfi if he ever made a rude comment about Lynne or any of the Spears clan.

As a result, Lutfi claims he's suffered and continues to suffer "mental, physical and nervous pain and suffering."

X17 photographers who were on the scene the night of the alleged attack recall hearing arguing between Jamie and Sam....so did that argument escalate into something more violent?

CHECK OUT THE GALLERY FROM THE NIGHT IN QUESTION BELOW!!