The phrase "allegedly ended" is correct and usable in written English.
It can be used when discussing an event or situation that is claimed to have concluded, but where the truth of that claim is uncertain or disputed.
Example: "The investigation into the incident has allegedly ended, but many questions remain unanswered."
Alternatives: "reportedly concluded" or "supposedly finished".
Then a doctor allegedly ended his life — without his consent.
One allegedly ended in an erotic game known as "Bunga, Bunga".
An argument took place, which allegedly ended with Abeid being injured.
When Mumford argued, he allegedly ended up in a scuffle with US marshals, resulting in his arrest.
Bill Clinton allegedly ended that part of their relationship in May 1997; Lewinsky had been telling a friend, Linda Tripp, about their relationship, not suspecting that Tripp was taping their conversations.
The money allegedly ended up in the bank account of a private firm, Malabu Oil and Gas, owned by Nigeria's former oil minister, Dan Etete, now under criminal investigation for his involvement in the affair.
An investigation in 1998, a decade before Victim 9 was allegedly raped, ended with Sandusky being advised not to take showers with children.
Police officials said the first accident occurred when Mr. Bryson, who was driving a Lexus, allegedly rear-ended a Buick that had stopped for a passing train.
Ben Griffin could be jailed if he makes further disclosures about how people seized by special forces were allegedly mistreated and ended up in secret prisons in breach of the Geneva conventions and international law.
Neither could have legally bought a gun in Massachusetts, but nonetheless illegally acquired a black, Ruger P95 handgun from Maine, which they ended up allegedly using to kill 26-year-old MIT Police Officer Sean Collier.
After reportedly going through his girlfriend's computer, Conyers III "body slammed her" and "spit on her"; when she tried to call police, he allegedly chased her then ended up cutting her arm with a knife, according to the complaint.
