2X4s? Womanly dude.
A situation that involves a wretched imposter calls for brutality. First, you break into his house at night and secure the imposter and his family. You do this with rope and electrical tape. Secondly, you alternate between strangulation with a standard network cord and fatal beatings with a steel chain on the imposters family until they are all dead. Of course, this is done as the imposter watches helplessly. Lastly, you proceed to cut the imposter's left leg off with a rusty hack saw and try to beat him to death with it before he bleeds to death.