The Wall Street Journal reports that Research In Motion (RIM) has lost another executive: this time it’s Brian Wallace, VP of Digital Marketing and Media. Wallace has left RIM for Samsung, which confirmed he’s joined the company.

“Mr. Wallace’s departure comes amid a time of turmoil for Waterloo, Ontario-based RIM. The BlackBerry maker is bleeding market share in the U.S. as its aging product line struggles to compete against Apple Inc.’s iPhone and devices powered by Google Inc.’s Android-operating system, such as Samsung’s Galaxy. Last week, RIM’s shares fell to five-year lows after the company issued disappointing second-quarter guidance and said it would begin reducing its head count.”

Wallace is the latest high-profile marketing executive to leave RIM. Since the start of the year company lost its chief marketing officer and its VP of “Brand Creativity.” What’s more, last week, one of the company’s three chief operating officers went on temporary medical leave.

Another senior RIM executive leaves BlackBerry maker | Wall Street Journal