A pensioner and her 25-year-old son have been released on bail after they were arrested on suspicion of encouraging or assisting a suicide.
A Sussex Police spokesman said: "It is an offence to encourage or assist suicide under the Coroners and Justice Act 2009 and officers are investigating whether any crime has been committed or is likely to be committed if they do not take action."
More top news
Pregnant women who smoke are more likely to give up if they are given shopping vouchers, new research suggests.
Children are eating the equivalent of seven and a half chocolate fingers for breakfast, campaigners have warned.
Stephen Fry has suggested that the "the patter of tiny feet" may be on the agenda following his wedding to Elliot Spencer.