She killed herself! It's hard to explain but she set it all up. She went to Martha and asked her to give her money and that if martha didnt she would tell the police all the corupt stuff jack has done. But then she didnt turn up to meet martha but when Martha was asked by the cops where she was on the night of Sam's death she lied about it and it made her look like she killed sam - just what Sam wanted!
Sam also scrachted Martha's face so that her DNA would be under her fingernails. She also stole a piece of writting paper from a pad in martha's bedroom and took a hair of martha's and then wrote a suacide note on the paper and planted it along with the hair in a car. It then looked like Martha had written the note and killed Sam! Sam also bought some drugs from this guy (to OD on) and then started going crazy and attacking him in this bar so these two guys had to pull her out by the arms - which is just what she wanted! Because it gave her bruises on the arms so it looked like two people (martha and jack) had held her down and injected her with drugs. Then Sam floated out into the water, injected herself with the drugs, and then pulled out the plug of the dingy so that she would OD from drugs before she drowned - so it looked like she was killed!!
Ok so I think that was all. Sam wanted to die but she didn't want Martha to get Jack after she was gone so that is why she tried to set up Martha, but it didn't work because Morag worked it all out.
Hope that helps
