Police say a body found in Ystrad Mynach yesterday is that of a 75-year-old woman.
Officers were called to an address in Nelson Road near to Ystrad Mynach Train Station at approximately 5.45pm yesterday on Tuesday.
On arrival, the body of a 75 year woman was found. Police say her death is being treated as suspicious.
A 47 year old, local man was arrested at the scene on suspicion of murder and is currently receiving hospital treatment for minor injuries.
The family of the deceased are being supported by specialist officers.
Police are now appealing to anyone who used the Ystrad Mynach Train Station at any time yesterday to get in touch by calling 101.
Two more Labour councillors including one from Newport have been suspended over allegations of anti-Semitism, the party has said.
Miqdad Al-Nuaimi, a councillor in Newport, south Wales, and Terry Kelly, who sits on Renfrewshire Council, have been suspended "pending an investigation", a spokesman said.
The move came as the party's candidate for London Mayor, Sadiq Khan, apologised for referring to moderate Labour councillors as "Uncle Toms".
David Cameron and Jeremy Corbyn have also exchanged verbal blows in a furious House of Commons spat over the issue, as the Prime Minister demanded that the Labour leader withdraw a previous description of Hamas and Hezbollah as "friends".
Mr Corbyn insisted that "I absolutely do not approve of those organisations" and said that Mr Cameron should follow his lead in launching an inquiry into racism within his own party.
Welsh political parties are making their final push for votes ahead of Thursday's Assembly elections.
The ruling Labour administration goes into the vote seeking a fifth consecutive term in office - but faces strong criticism from rivals over its 17-year rule.
At the last election it won 30 out of 60 Senedd seats.
The Welsh Conservatives got 14, Plaid Cymru 11 and the Welsh Liberal Democrats five. A recent poll by ITV Wales and YouGov predicted that Ukip would win its first ever seats in the Assembly.
Welsh Labour leader and First Minister Carwyn Jones will use the final day to rally support in Cardiff, while Tory chief Andrew RT Davies is set to complete a 36-hour tour of Wales.
Plaid's Leanne Wood was using the eve of the vote to reach out to "disillusioned" Labour voters.
She said: "For people who want to strengthen and protect our public services, who want to deliver fairness and equality in our communities, and who want a government that will look after people from cradle to grave, you can be confident that Plaid Cymru wants that too."
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The final poll of the Welsh Assembly Election 2016 campaign will be published later today.
The results will be revealed on Wales At Six and on the ITV News Wales website.
For the first time in any Assembly Election, a poll of how people who have actually voted will be carried out on polling day on Thursday May, 5.
The findings will be announced exclusively on ITV’s Wales Decides 2016 overnight results programme at 10.30pm. It will be the third YouGov poll of the campaign to be commissioned by ITV Wales in conjunction with Cardiff University.