Jan Latham-Koenig was given a 14-month prison sentence suspended for two years.
Jamel Boyce was left blind, paralysed and unable to speak and died in a care home in February 2022.
Anita Mukhey, 66, was stabbed in Edgware, north London, on Thursday and was pronounced dead at the scene.
She died 15 years after her diagnosis and showed ‘it is possible to live life to the full with cancer’, the charity said