George- Saddest television death of all time for me. First, of all it was a complete shock. Like I really thought George was going off to the army, so to find out that he was John Doe caught me completely off guard. And then the way they just set the whole scene up, with him writing 007 in Meredith's hand and how she realizes its George and runs through the hallways and then George and Izzie meeting during limbo</3 Truly, heart breaking! He was my third favorite GA character ever.
Mark- So sad;( This one didn't come as a shock to me because I had read about how Eric wanted to leave GA and that they were going to kill Mark off, but the way they portrayed it was heart breaking. How at first he was all pumped up and excited about life, but he soon realized how he was going to die and asked Avery to bring his daughter to him, but then died before she even got there</3 He was my fourth favorite GA character, and his death hit me hard.
Lexie-Yet, another GA character on my list</3 This came as a shock to me, I knew someone was going to die in the plane crash but I was really hoping it wouldn't be Lexie! But when I saw her stuck under the plane, I knew it was going to be her. The way Mark talked to her and told her he loved her before her death broke my heart. And when Cristina knew that Lexie was going to die I seriously lost all hope, because I knew that once Cristina accepted it, it had to be true. One thing I do have to complain about is, the fact that she was killed off so fast and then barely remembered for the rest of the episode. I also hated how her body got eaten by the animals. I at least wished they gave her a proper burial. Fifth favorite GA character</3
Cam- So a friend of mine told me he died before I even started watching Degrassi season 12, because both her and I thought I wouldn't watch it because I had quit on Degrassi a few seasons back, but his death completely shattered me, because it was suicide. Even if I didn't know he was going to die, I think I would have somehow seen it coming because he was so alone, scared, and has so much pressure on him that he was bound to break eventually:( He became my favorite Degrassi male character within a few episodes and his death was so heart breaking.
Marissa- Marissa was a pretty awesome character, she wasn't my favorite and she got on my nerves a bit, but over all I thought she was a very interesting and complex character and even more than that I was the biggest Ryan/Marissa fan. I adored them, and they were my favorite part of the O.C. so her death really got to me, because I knew her and Ryan would never get their happy ending. Plus, the way Ryan carried her out of the explosive car and Hallelujah playing in the background really added to the scene.
Freddie- My favorite male generation 2 character and half of my all time favorite Skins couple, Freddie/Effy! I was so sad when he died. My heart literally broke because Effy had just gotten out of the hospital and she was starting to get better and they could have started over and had it all! Honestly, his death would probably be higher up on my list if it wasn't done in such a stupid way. Like really beat to death with a bat by your girlfriends crazy psychiatrist? Ridiculous. I also hated how we never saw any of the character's reactions to his death, considering he was such a big part of the show.
Prue-So I admit, I'm one of those rare Charmed fans that preferred the Paige seasons over the Prue seasons, but her death was still so heart breaking</3 It just broke me because originally it was supposed to be Piper who died (thank goodness it wasn't), but starting time over ended up killing her instead, which meant that one of the sisters just had to die</3. She was such a big part of her sister's lives and like a mother figure to them, so seeing Piper and Phoebe break down after her death added on to how heart breaking her death was.
Chris-Another death that caught me off guard! He was having fun and smiling before his death and then bam, he just falls down and died. I was so shocked. He was one of my favorite Skins character and he was so sweet, loving, and caring so his death really got to me. Especially how Cassie was there and how she completely broke down, and then how his father wouldn't let any of his friends come to his funeral. Super sad.
Keith-Shocking and sad</3 I just adored Keith. He was a part of all the kids lives whether it was in a small way or a big way, he was basically Luke's father, he'd just gotten together with Karen after years of wanting too and then he gets shot to death by his own brother. Truly heart breaking and sad.
J.T.-Another random and shocking death. It was so cruel, how he got stabbed to death just because of some stupid bitter rivalry. He was a great character on Degrassi, super funny, sweet and caring<3 and although I'm not a fan of the couple Liberty/J.T. I thought it was really sad how he died right before he was going to tell Liberty he loved her and then when Liberty found him and began to scream for help, it was horrifying</3

or Marissa's but in my opinion the saddest tv death was Jen Lindley's.

Lexie
Mark
Marissa
George
Keith

Mark..... :(

Also George, Marissa & Prue (I also prefer Paige seasons over Prue's)
I'm also sad about Mark & Lexie's deaths but I stopped watching GA before that so I haven't seen the scenes

Ughhh most of these =[ I was torn between choosing Lexie and George, and sometimes i think George is the saddest, but I'm just in a mood right now and thinking about the shitty way Lexie got killed off... I'm about to go watch that damn scene and cry slash scream in rage!

The only ones i don't know/care about are:

Cam- Don't know him, but it sounds sad =[
Prue- Haven't watched Charmed regularly yet, though i remember one episode where [i think] it seemed like they were killing Prue off, they were going to burn her or something?? but then at the last minute it didn't happen... and i remember being like, "NOOO!"
Freddie- You'll probably want to slap me so I'll just apologize upfront - I did NOT like Freddie very much so i just didn't really care when he was killed. Also, like you said... it was STUPID! And it was stupid how they barely acted like anything was off in the finale.

It never fails to make me cry no matter how many times I've watched the show.