the one who opened the pit must pay the owner for the loss and take the dead animal in exchange.
“If anyone’s bull injures someone else’s bull and it dies, the two parties are to sell the live one and divide both the money and the dead animal equally.Exodus 21:35 NIV
“If anyone uncovers a pit or digs one and fails to cover it and an ox or a donkey falls into it,Exodus 21:33 NIV