Hajjaj Saadi, who was handed five death sentences, complained shortly before his execution that had not been given any assistance from the Egyptian government, a witness said.
Saadi strongly denied in court that he had committed any of the crimes, which shocked the Kuwaiti public, and insisted his confessions were extracted under duress.
Arrested in July 2007 as he prepared to board a flight to Luxor in Egypt, he became known as "the Hawalli monster" for the district near Kuwait City where the crimes took place.
Another Egyptian man was executed at the same time after he was found guilty of killing an Asian couple by setting their home ablaze and attempting to murder another couple from Egypt the same way, said the prosecution.
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Ahmad Abdulsalam al-Baili poured an inflammable material in the apartment of the Asian pair and set it on fire in April 2008, causing their deaths, it said in a statement.
Later he tried to kill an Egyptian couple the same way. They survived despite suffering injuries.
In April, the authorities in the oil-rich Gulf state executed a Saudi, a Pakistani and a stateless Arab who were convicted of murder.