British Transport Police
The rail worker died of coronavirus in April last year, two weeks after allegedly being spat at in London's Victoria station.
Police have warned from the start that stretched resources would make enforcing the coronavirus law almost impossible.
Medical tests confirmed the suspect accused of spitting at the 47-year-old while she was on duty had not been infected with coronavirus.
The Victoria station worker died two weeks after she was attacked by a man who claimed to have Covid-19.
Black Lives Matters protesters have called for justice after police closed the investigation saying there was no evidence of spitting on CCTV.
BTP said senior detectives were "confident" the 47-year-old did not contract Covid-19 from the incident
British Transport Police said there was no evidence to substantiate a criminal offence having taken place.
Anti-hate crime charity says increase is "quite clearly" linked to Covid-19 and points to Donald Trump's "Chinese virus" comments.
The ticket officer died in April after being assaulted while working at Victoria Station.
Exclusive: British Transport Police confirmed they only heard about incident at Victoria station in May.