Commons Deputy Speaker Lindsay Hoyle has said he is "truly devastated" by the death of his daughter Natalie.
The Labour MP said his family will never be the same following her death.
Chorley MP Mr Hoyle said on Twitter: "I am truly devastated by the death of our beautiful daughter Natalie.
"Our family will never be the same without our loving granddaughter, sister & aunty.
"Thank you for the kind support we've received it is overwhelming. Please continue to respect our privacy & allow us to grieve."
Ms Lewis-Hoyle, reported to be 28, was the daughter of Tory councillor Miriam Lewis, who urged anyone with information about her sudden death to get in touch with Essex Police.
"It is with unbearable sadness that I have to announce the sudden death of my beautiful, much adored daughter Natalie," the Maldon district councillor said on Facebook.
She asked anyone contacted by "Natty" on Thursday night to get in touch with police and said her daughter's mobile phone was missing - possibly left on a train from London Liverpool Street to Ipswich.
She added: "Natalie is my only child, my mini-me. Please help me find out what happened to her in the hours before her death."