SPOILERS for Remain by Nicholas Sparks with M. Night Shyamalan

 

This post contains spoilers, proceed with caution. 

Louise and Reece, the property's caretakers, killed Wren. Reece was a distant relative of Wren's and he thought if Wren was gone, the property, and the inheritance would go to him. 

It was Reece who had attacked Tate and left him for dead. He also set the house on fire.