Didn't hear Costas, and didn't read fatty's article, but y'all are kidding yourselves if you don't think a gun made it easier to do. I'm not saying he wouldn't have did it without a gun, but either with a knife, or strangling ( both mentioned in here) it takes a different mentality to do it like that.
It's a lot more personal to do it either of those ways, and some ppl just aren't built for that kind of stuff. Enter firearms, and it's much easier to pull a trigger than to look in someone's eyes as you're stabbing or strangling them to death, especially someone you're close to and supposedly love.
Again, not saying he still wouldn't have done it, but stop acting like the gun factor didn't make it much easier for him to do.