he chose a sig sauer 22 pistol that had a history of jamming after the first shot was fired.wicz (voiceover): would katie be the next victim? it was scary. i saw him drive by my house. and i had told my lawyers. he said, well, honey, you're bulletproof. and i remember telling him, as long as i'm not within rifle range. josh mankiewicz (voiceover): when "dateline" continues. in the fridge. >> it's not dog food. it's fresh pat. >> real meat. >> real veggies for. >> my boy. >> junior. >> junior. >> what are we doing here? -we're done. -what about these? looks right. nooo... nooo... quick, the quicker picker upper! bounty absorbs spills like a sponge. and is 2x more absorbent so you can use less. bounty, the quicker picker upper. [coughing] copd is an ugly reality. do you have his medical history? i watch as his world just keeps getting smaller. but then, trelegy helped us see things a little differently. with 3 medicines in 1 inhaler, trelegy keeps airways open for a full 24 hours and prevents future flare-ups. once-daily trelegy also improves lung function, so he can breathe mo

exactly an unusual find in the lone star state, but one small gun turned out to be a very big deal, a sig sauer pink frame. josh mankiewicz: it was a .22. it was, indeed. josh mankiewicz (voiceover): the same caliber as the bullet that killed robin. what's more? allan mongold: the gun's broken. it's got broken pieces on it, which are pretty odd. josh mankiewicz (voiceover): so investigators went back to the crime scene, and sifted through the soil around where the tahoe had been, and they found a .22 caliber shell casing and two tiny fragments. josh mankiewicz: no question, those two little chips found on the ground fit that gun. fracture matching, they match. like a jigsaw puzzle. just fits right in there. josh mankiewicz (voiceover): and just as the pieces of the pistol fit together, so too did a clearer picture of what happened that night, like those inexplicable marks and pink residue on robin's window. allan mongold: you envision a scenario where somebody is beating on the glass with a gun. why would somebody bang on a window with a gun? anger. josh mankiewicz (voiceover): it looked as if