A Birmingham mother attacked by a gang of youths at a city centre bus stop six weeks ago has died.
Tracey Cullum, aged 31, suffered a blood clot to the heart and died despite a desperate battle by her partner to save her.
Detectives believe her death is linked to the brutal attack last month when she was punched by a thug while waiting for a bus with her son.
Her grief-stricken partner Mark Holliday said: "There cannot be enough punishment for this."
Fighting back tears, Mr Holliday, a 37-year-old engineer, said: "She was such a bubbly down-to-earth person.
"She had a great understanding of children and had done a classroom assistant course and a course in sign language."
Her son Ashley, aged 12, has been taken away by family friends to help him come to terms with his mother's death.
Ms Cullum was waiting in Colmore Row for the number 29 bus with Ashley, a female friend and three other children when she was attacked at 10pm on Saturday, July 2.
Police said the group were approached by four youths wearing hooded tops. Ms Cullum became involved in a row with one of the youths who then lashed out at her.
She was punched in the face and knocked to the ground, suffering a broken ankle and minor facial injuries. She was treated and later released. But she fell ill last week and was re-admitted to hospital.
Mr Holliday, who had lived with Ms Cullum and Ashley in Selly Oak for the past five years, added: "She was feeling unwell on Friday and then at the end of the night she was going to bed and had a funny turn at the top of the stairs.
"She went to bed and collapsed and I had to do cardiopulmonary resuscitation for 20 minutes before the ambulance came - but she had died." A West Midlands Police spokesman said: "Officers believe there is a link between the initial assault and Ms Cullum's subsequent death. Therefore her death is being treated as suspicious."
All four youths are described as black. Ms Cullum's attacker was aged between 16 and 18 and between 5ft 4in and 5ft 6ins.
In an inquest into her death was yesterday opened and adjourned until September 8.