Tom Bergeron will be without co-host Erin Andrews, right, this week on "Dancing With the Stars."

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Andrews is coping with the death of her boyfriend's nephew

Someone else will fill in for her on Tuesday night's show

CNN  — 

Tom Bergeron will be performing solo Monday night.

The “Dancing With the Stars” co-host tweeted Sunday that he’ll be on his own for the first of the show’s two episodes this week. His usual TV partner, Erin Andrews, is taking some time off because of a tragedy, he said.

“My pal @ErinAndrews will be absent from @DancingABC this week to support @jarretstoll whose nephew passed away. Sending hugs and condolences,” Bergeron tweeted.

Jarret Stoll, a pro hockey player and 14-year NHL veteran, is Andrews’ boyfriend.

Andrews has not spoken publicly about the death of Stoll’s nephew. On Sunday she tweeted about the loss of Miami Marlins star pitcher Jose Fernandez, who was killed over the weekend in a boating accident.

She tweeted “No words…awful.”

Related: Miami Marlins star pitcher Jose Fernandez killed in boating accident

Bergeron said on Twitter that an as-yet undecided person will be filling in for Andrews during the live results show Tuesday.