Diffie revealed he tested positive for COVID-19 on Friday.
Howard died peacefully in Gallatin, Tennessee, on Saturday.
Mercader had fought cancer and related illnesses for more than 20 years.
The news was confirmed by his ex-wife, Eva La Rue.
Neal starred for the legendary traveling team from 1963-1985.
The actress took to Twitter on Thursday to pay tribute to costumer Josh Wallwork.
The veteran actor was 69.
Beekman started all 13 games for the Cougars a season ago after transferring from Arizona Western.
The famed chef died on Wednesday after testing positive for COVID-19.
The Tony-winning playwright was 81.
The reality star is mourning the loss of her baby girl.
Doherty shared that the two had been friends through 'boyfriends and husbands, divorces, tears and laughter.'
Savannah Guthrie and Al Roker reacted to the sad news via social media on Friday.
The comedian shared the sad news to Instagram on Tuesday evening.
