[header] How to kill a cricket that's loose in your house [title] Place cricket traps. [step] Purchase a few sticky traps (typically meant for rats or mice) and place them around your home wherever you believe there might be crickets. The crickets will walk over the trap and get stuck. 
[substeps] Placing a bit of cornmeal in the center of each trap will help attract the crickets to the traps. [title] Use a beer can to catch the cricket.