we didn t decide to do it. it was, we finally just kinda got overwhelmed with this panic and emotion and and made the decision to to run in that room. reporter: the outside world saw what they thought was evidence of a lot of premeditation using a friend s driver s license to, you know, hide the fact that you went to san diego and got weapons. i d have to say, keith, that there s you know, it s just not really entirely accurate. i didn t have a california i.d. so there was no way to purchase a weapon other than my brother using this other kid s i.d. reporter: but, no disputing it, they did buy the guns in advance with a stolen i.d. and there was this irrefutable fact the prosecutor pointed out lyle reloaded and fired that final shot at his mother s face while she was still alive and crawling desperately to get away. they saw that as the evidence of premeditation and cruelty. i certainly in the room
boys. poor boys? and, these poor boys, these orphans. reporter: orphans, an impression the defense tried to play up. leslie abramson wrapped her arms around their shoulders. had them trade their dapper suits for preppy sweaters. everything that jill lansing and leslie abramson did was deliberate and calculated. reporter: prosecutor bozanich steeled herself, determined not to let the optics distract the jury. based upon this evidence, it will become apparent that this murder was unlawful, unjustified, and wholly premeditated. in basic english, the prosecution s case was this. just the facts, ma am. reporter: fact number one. lyle and erik driving down to san diego, two days before the murders, to buy shotguns and with a stolen i.d. why are you using the fake i.d.? because you know you re gonna be using the gun to do something you shouldn t be doing. that is evidence of intent. reporter: after the murders, the prosecution showed the
shells. what did that say to you? somebody collected the shotgun shells. but who does a thing like that, if they ve got a messy crime scene of that sort? somebody that didn t want fingerprints on the shotgun shells, is the only thing i could think of. while investigators examined the crime scene, lyle menendez, then 21, and erik, 18, went to the station to speak to police. the brothers said they were in and out throughout the day. and then as evening approached, they decided that they wanted to go to the movies. they wanted to see a james bond movie. but it was sold out. so they saw the batman movie, which they had both seen before. so they decided to see that again. curious. after the movie, they told detectives, they d planned to meet a friend for a drink at the cheesecake factory, but they had to go back to the house to pick up erik s fake i.d. and when they walked in, they said, they saw a haze in the air, smelled gun powder smoke, went into the den, and then