The Doctor Who star lost her long battle with cancer in July (12) and her devoted husband, Marcus Ringrose, passed away just hours after delivering a "stunning" 20-minute eulogy at her memorial two weeks later.
An inquest heard that Ringrose, 59, died of Sudden Adult Death Syndrome which can be triggered by emotional distress, causing a massive disturbance in the heart's rhythm.
Deputy Coroner Dr Shirley Radcliffe recorded a verdict of death by natural causes and said, "The condition can be triggered by stressful and emotional events which undoubtedly Mr. Ringrose had been going through."
Marcus Ringrose read his late wife's eulogy at a church service in Battersea on Tuesday (07Aug12) but didn't live to see out the day.
Tamm, who played Tom Baker's time-travelling assistant Romana on TV, lost her battle with cancer last month (Jul12) at the age of 62.
The British actress also starred opposite Jon Voight in The Odessa File and featured on hit U.K. TV shows The Likely Lads and Brookside.
Tamm, best known for her role opposite Baker in the cult sci-fi TV series in the 1970s, passed away at a hospital in London after an 18-month battle with cancer. She was 62.
Baker admits he is devastated by Tamm's passing and has heaped praise on her, declaring, "She was a darling companion and wonderfully witty and kind. I'm so sorry to hear of her death."
Tamm's actress pal Helen Lederer adds, "Mary was such an energised, talented woman with a great twinkle in her eye and she was so very beautiful."
Tamm, best known for her role in cult sci-fi series Doctor Who in the 1970s, passed away at a hospital in London on Thursday (26Jul12) after an 18-month battle with cancer.
She began her career as a stage actress in Birmingham, England before landing roles in several movies, including The Odessa File and The Likely Lads.
In the late 1970s, Tamm became a household name in the U.K. when she played Doctor Who's companion Romana in the 16th season of the hit time-traveller show.
After her run in Doctor Who, Tamm became a regular fixture in British TV drama shows and soap operas, and also continued working in theatre productions.
Her agent Barry Langford tells the BBC, "(Tamm had a) zest for life... She was a fantastic actress. She played stage parts of such range, parts that would take your breath away. She could play any role, and do so wonderfully."