A contaminated batch of heroin is believed to be to blame for the deaths of two Shropshire men last week. One of the victims, who was from Wellington, was discovered by his partner on 6 June.
The second man, also from Wellington, was found five days later.
Police are waiting for the results of toxicology tests.
Post mortem examinations were due to be carried out on both men on Friday.
Police are not yet releasing their names.
Heroin users are being advised to get help immediately if they start having medical problems.