randy jr.an alert officer noticed something suspicious. >> a canine sergeant sees stuck between the lid of the dumpster and the dumpster itself, a zip tie. i drive down there. i immediately identify it as the same make, size, of the ones used in the murder. that's a solid piece of evidence. >> that's your first break? >> yeah. >> randy sr. allowed police to search the business without a warrant. >> immediately we see there's a bag of the same type of wire tires that were used to tie up joseph morrissey. they also sell knives at the business. there's an empty box that holds a 15 inch bowie knife. when he's asked, where's the knife that belongs to this box, he tells us it should be be there. he doesn't know where it is. >> do you think at this point he's covering up for his son? >> i think that he's aware that things are not going good for his son, but it doesn't seem like he wants to cover for his son. >> so, this is a good citizen letting the police do their investigation? >> correct. >> and if