Justice Lawrence Wargrave - What an Evening!

What a strange sequence of events! Last night, after dinner had concluded, a strange voice came on over the loudspeaker. It called out all of the names of the guests at the house and told of them being responsible for the murder of many various people, including me, for the murder of Edward Seton. I remember that case very well now. Edward Seton was charged with the murder of an elderly woman. The jury had found him guilty, and I sentenced him to death, and rejected the appeal. He was executed. I was solely sentencing a convicted murderer, just like any other judge would. I was simply doing my job.
A loud thumping noise was heard in the other room. We all went to investigate and saw Mrs. Rogers sprawled out in a heap on the floor of the kitchen. The poor woman was scared half-to-death. She finally recovered and had a few drinks of brandy. The one mysterious thing about the recording was who set on the recording? I took into effect Mr. Rogers attitude while the recording was put on and asked if he was the person who put it on. At first he denied it, but he finally admitted to having set the recording on orders from his boss, Mr. Owen. Mr. Owen had instructed Mr. Rogers to put on a record in a drawer near the gramophone. He picked the only record and it was titled “Swan Song .” Mrs. Rogers was then told to put on the gramophone when Mr. Rogers entered the drawing room with the coffee.
The next hour or so was spent further inquiring about the accusations. I had realized that there was no "Mr. Davis" mentioned on the recording. I delved into this and found that this "Mr. Davis" was hired by Mr. Owen as well, and that his real name was William Henry Blore. "Why would it be necessary for him to lie like this?" I thought. Both Mr. Owen and Mr Blore have become very suspicious characters.
Most of the guests admitted to their "murders" but few actually considered it a murder. Mrs. Brent however denied all accusations and did not say anything more on the subject. Yet another person on my list of people to watch.