Has anyone heard the Radio Broadcast "Sorry wrong number"? please help!

Main suspect:

The suspect of the murder is Mr. Stevenson, the husband of Mrs. Stevenson.

Motive:

The motive behind the murder is because Mrs. Stevenson has been sick for a very long time. So, it seems Mr. Stevenson wanted to get rid of her. An evidence: "AGNES: …has scarcely left my side since I took sick twelve years ago…"

Alibi:

The suspect has an alibi. In order not to be suspected, he sent a Telegram to Mrs. Stevenson informing her that he will not be available that night due to an urgent business he was going for in Boston.

Evidence to support "WESTERN U: The telegram is as follows: (reading) Mrs. Elbert  Stevenson. 53 north Sutton Place, New York, New York. Darling,  terribly sorry. Tried to get you for last hour, but line busy.  Leaving for Boston eleven PM tonight on urgent business. Back  tomorrow afternoon. Keep happy. Love. Signed, Elbert."

Evidence:

Some of the evidences that points to Mr. Stevenson as the one responsible for the murder are:

1. Mr. Stevenson's phone line was kept busy all through.

Evidence from text: "AGNES: Operator, I’ve been trying to call Murray Hill 4-0098  for the last half hour and it’s been busy. I don’t see how it  could possibly be busy that long. Can you try that number for  me, please."

2. The suspect knew that a train passes by 11:15 and definitely it is someone that knew that area very well; which is Mr. Stevenson.

Evidence: "MAN: (OFF MIC) What’s that? (ON MIC) Just a minute, George.  (PAUSE) Oh, our client tells me that at 11:15, a train crosses  the bridge. It makes a noise in case a window is open and she  should scream."

3. Mr. Stevenson made up an alibi in order not to be available that night.

Evidence: "WESTERN U: The telegram is as follows: (reading) Mrs. Elbert  Stevenson. 53 north Sutton Place, New York, New York. Darling,  terribly sorry. Tried to get you for last hour, but line busy.  Leaving for Boston eleven PM tonight on urgent business. Back  tomorrow afternoon. Keep happy. Love. Signed, Elbert."

Explanation:

"Sorry, Wrong Number" is a play that was written by Lucille Fletcher. The play was a radio broadcast  which was originally produced and  broadcast live by Columbia Broadcasting. The original broadcast took place on May 25, 1943.

The drama tells the story of a woman who was an invalid and overheard the conversation of two men who were trying to kill a woman. She became restless and tried to stop the murder by informing the phone operators and the police but none was able to help.

Later, it dawned on her that she was the target of the murder. But unfortunately she was murdered. From all indications in the story, it was found out that her husband, Mr. Stevenson was behind the murder.

the type of supporting detail is fact!