The final newspaper article mentioning Capt. McGee, unbeknownst to me, was one I had in my files for several years, and it is this one which got me started looking this week.  It appeared in the Sunday, June 13, 1920, issue of the Telegraph-Herald:
STEAMER CAPITOL HERE NEXT WEEK
Boat Will Make Two Excursions on River Saturday and Two on Sunday
MOST MAGNIFICENT ON UPPER WATERS
Jazz Band, Cafeteria, Ball Room and Palatial Decoratins to Please Passengers
On Saturday and Sunday next, the new steamer Capitol will make her debut on the Mississippi at Dubuque.  There will be two excursions on Saturday under the auspices of the Epworth League.  Sunday the big boat will make an all day trip to Cassville, Wis. and this will be followed Sunday evening with a special dancing excursion by moonlight.  There has been so much interest displayed in regard to the first voyage of the Capitol that there will be undoubtedly be a capacity attendance to see the new steamer for the first time here and to inspect the fixtures and decorations that have given her the name and reputation of being the most magnificent and wonderful excursion steamer on inland waters.  More than 2,000 electric lamps alone are used to illuminate the dancing deck through the medium of the remote system and the effects are vari-colored, giving the semblance of a beautiful ballroom.  The steamer carries an excellent jazz band under the direction of Tony Evans, of Rock Island.  The boat also has on board a novel cafeteria, the only system of its kind on any steamer on the river.  Decorated with silken Japanese lanterns, terra cotta flower boxes, vari-colored lights, a giant searchlight of the battleship model, and enclosed mahogany stairways, the Capitol will create a very favorable impression at Dubuque.
The new boat is in command of Captain Cornelius McGee, of this city, and in the pilot house are Captains Walter Blair and Walter Hunter.  Ten large life-saving boats are  swung from davits from the upper deck, and there are life rafts and thousands of life preservers.  Following the four excursions here next Saturday and Sunday of the Capitol, the new steamer will continue on her way north where she will start the return trip from St. Paul.  It is expected that the Capitol will make excursions from Dubuque all summer at regular intervals of about two weeks.  The St. Paul and the J. S. (Streckfus's two side-wheel excursion steamers), will operate out of St. Louis all summer and the Sidney (the other sternwheel excursion boat in addition to the Capitol), will continue at New Orleans.
 
Well, that's the extent of information I have about Capt. Connie McGee at this time.  My hope is that some of this information will be useful to you in your research about your grandfather.  The Streckfus Steamers is no longer in business, of course, but one individual you may want to contact for information is Capt. William Carroll of St. Louis.  I don't have his address, but I'm sure directory assistance cna help you with that.  Capt. Carroll married into the Streckfus family, and he was the last Captain on the gigantic steamer Admiral at St. Louis until she quit running in the late 70's.  He could probably provide you with stories and names of employees of the company, as he was the historian for the steamboat line and gave many lectures about steamboating aroung the St. Louis area.  Another individual you may want to contact is Capt. Clarke Hawley.  Capt. Hawley was mate and captain aboard the last "tramp" excursion boat in the United States, the steamer Avalon, and he learned that trade from many of the old-timers in the 1950's and 60's. 
Best of Luck in your search!!  Keep me posted about what you discover, as I have a special interest in excursion steamboating.  I became interested in steamboats by riding the Avalon when a youngster here in Dubuque.   Later on, I worked thirteen seasons aboard the tourist steamboat Delta Queen, during my summer vacations from my job here as a junior high school math teacher.  Again, my apologies for delaying so long in answering your letter.  Someday, when I retire (in just a couple more years), I hope to write a history of excursion steamboating in Dubuque.  And I suppose that Capt. Connie McGee will certainly play an important role in telling that story!
With sincerest best wishes,
David Tschiggfrie
 
I have contacted Capt. Clarke Hawley & William Carroll~they have been unable to give me any further information in which I have on Cornelius McGee.