Police said emergency services were called to an address in Stonefield Way at about 10.15pm on Wednesday (January 26) after concerns for a woman were raised.
Paramedics commenced CPR but the 55-year-old woman from Burgess Hill was declared deceased, police said.
A Sussex Police spokesperson said: “A 79-year-old man from Burgess Hill, who is known to the woman, has been arrested on suspicion of murder and remains in police custody.”
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A Sussex Police spokesperson said: “A 79-year-old man from Burgess Hill, who is known to the woman, has been arrested on suspicion of murder and remains in police custody.”