I have to honestly say that I've stopped watching the show. I only watched it sporadically in seasons one and two (although I bought season 1 on DVD and have now watched it all), but the show just doesn't seem the same without Speed there.
I'm still mad at them (the writers) for killing him off. I get that the actor wanted out of his 6 year contract but why kill him? They could have easily just written him off and then if for some reason the actor decided to come back, oh look he can. Ugh writers sometimes.