People are being invited to join a vigil for MP Jo Cox at Leicester's Clock Tower this evening.
The event is due to begin at the city landmark at 5pm and to bring candles, banners and flowers with them.
The 41-year-old Labour MP was shot and stabbed in the street while holding her regular constituency surgery in Birstall, West Yorkshire yesterday.
She died later in hospital.
Her attacker is reported to have shouted "put Britain first" at least twice. A 52-year-old man has been arrested.
Leicester South MP Jon Ashworth, who will attend this evening's event, said: "It is an unspeakable tragedy and I will be there to pay my respects and I hope others will join us."
Leicester's deputy city mayor Rory Palmer said: "I didn't know Jo, but the tributes last night and this morning show how Jo was held in the highest regard across politics.
"This awful and heartbreaking tragedy is saddening beyond words. Everyone in politics, locally and nationally is united in their shock and grief.
"There is a deep sense of grief, loss and disbelief in the Labour Party. The Labour family is pulling together to support Jo's family, colleagues and friends."
Campaigning ahead of the EU referendum has been suspended for the time being as a mark of respect.
MPs have been urged to be 'vigilant' in the wake of the killing.
The National Police Chiefs Council said it had circulated the advice to individual forces and to politicians.
