There is a Donald J Hoodecheck that resides in St Joseph Minnesota. He is in his mid 70s. He may be the same as the person with the same name who graduated from Notre Dame in 1955 and was a professor emeritus of education in St Benedict in Minnesota who retired in 2011. St Joseph is about 100 miles from Mankato, It is odd that is says St Josephs Hospital on the telegram. The only St Joseph Hospital I could find is in St Paul. I only had a few minutes to research this. His last known address was on 5th Ave in St Joseph. Give him a call and he might be able to put the pieces together for you.
A phone number also comes up on the search but it is not for me to post someones number or complete address on line.